Load functions can't handle relative paths

[wilsonsilva]

For example Raylib.load_model("resources/models/iqm/guy.iqm") only works if I write it as Raylib.load_model("/Users/wilson/projects/rb/raylib/examples/models/resources/models/iqm/guy.iqm")

[Studio-Lotus]

Using global version instead of namespaced fixes this (on my system at least)